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Online Edition: "Specifications for Flavourings"

Flavouring alpha-Ionone
Synonym(s) alpha-Cyclocitrylideneacetone
Latest JECFA evaluation 2001 (Session 57)
Status of specification Full
Chemical name 4-(2,6,6-Trimethyl-2-cyclohexenyl)-3-buten-2-one
JECFA number 388
CAS number 127-41-3
FEMA number 2594
COE number 141
FLAVIS number
Molecular weight 192.3
Chemical formula C13H20O
Physical form/odour colourless to pale-yellow liquid with a warm, woody, violet-floral odour
Solubility soluble in alcohol, propylene glycol, most fixed oils; insoluble in glycerol and water
Solubility in ethanol 1 ml in 3 ml 70% alcohol; 1 ml in 10 ml 60% alcohol
Boiling point (°C) 237°
Assay min % 85% (min. 95% sum of isomers)
Acid value max
Refractive index 1.497-1.502
Specific gravity 0.927-0.933
Other requirements
ID Test IR